Combined inner metal shield and outer metal grip for bobbins and the method of making same



C. E. CUNDEY COMBINED INNER METAL SHIELD AND OUTER METAL GRIP May 26, 1931.

FOR BOBBINS AND THE METHOD OF MAKING SAME Filed July 19, 1928 R 7 2 mm INVENTOR:

l q I a y r I I% ATTORNEYS.

Patented May 26, 1931 PATENT OFFICE CLARENCE E. CUNDEY, 0F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T0 JAMES H. BILLINGTON COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA COMBINED INNER METAL SHIELD AND OUTER METAL GRIP FOR BOBBINS AND THE METHOD OF MAKING SAIWIE Application filed July 19,

My invention relates to a new and useful combination metal shield and outer metal grip, for bobbins and the like, and it relates to a novel method of making and applying the combination metal shield and grip to the lower terminals of bobbins, whereby a more durable metal grip is produced thereon, and whereby the cost of producing the same is greatly reduced. My invention relates more particularly to the type of bobbins adapted for automatically reloading shuttles.

In automatically reloading shuttles, the shuttle body is open at top and bottom, and a pair of coact-ing spring clamps are provided at one end of the bobbin chamber of the shuttle, having corresponding aligned and juxtaposed grooves therein, which are adapted to receive the lower end of a bobbin, which is provided with suitable spaced metallic grip rings or annular beads which protrude slightly and which are adapted to lit into the juxtaposed and aligned grooves in the spring clamps, between which the lower end of the bobbin is adapted to fit, thereby securely retaining the bobbin in position. lVhen the bobbin, in this type of shuttle, is empty, a fresh or full bobbin is thrust down from above onto the empty bobbin, thereby displacing and forcing the empty bobbin out of the shuttle through the bottom thereof and at the same time inserting the full bobbin into the shuttle and snapping the metal grip ring on the lower end thereof, between the two spring clamps.

In actual operation, the reloading of a shuttle of this automatic type is extremely rapid, with the result that the shuttle, the spring clamp at one end of the bobbin chamber thereof, and the metal guiding and grip rings at the lower end of the bobbin, are sub jected to a great amount of strain and wear, as the bobbins are forced into and out of the spring clamps, with each reloading operation.

It has been the practice heretofore to provide the metal grip ring or guide ring at the lower end of the bobbin, by forming a suitable number of spaced annular grooves in said lower end of the bobbin, of substantially semicircular cross section, and seating in 1928. Serial No. 293,828.

each of said grooves tightly, a split ring of a suitable hard spring wire, of suitable thickness; and the juxtaposed terminals or broken ends of the rings, were slightly beveled and disposed in close proximity to each other, and staggered between the several rings thereby to provide a smoothgripping ring surface as it is being forced into and out of the spring grip or clamp in the shuttle.

It is the common experience in the use of this type of bobbin, with the automatically reloading shuttle, that after even a moderate amount of use, the rings become loose, and finally break or drop oil, with the result that the bobbins either drop out or get dislodged, with a resulting loss not only of the bobbin but also possible breakage of the shuttle. The loss due to this cause has always been considerable, and in fact-has acted as a deterrent to the use of automatically reloading shuttles. v

According to my invention I combine, in one integral unit, the inner metal shield in the lower terminal bore of the bobbin and the outer metal grip, and provide a unitary structure whereby an outer metal grip is provided which will be more durable and permanent than the metal grips made heretofore on this type of shuttle, and one which will always present a true, annular metallic grip ring to the spring clamp of the shuttle, thereby relieving the shuttle and the bobbin of the great strain otherwise resulting when the terminals of the wire rings encounter the spring clamps in the shuttle.

With the above ends in View, my invention consists in the provision of a series of spaced, annular beads or swells, surrounding the lower end of the bobbin, usually three in number, and said beads or swells may be either formed in the wood itself or may be formed by placing suitablemetallic rings around the lower end of the bobbin, thercby providing metallic beads or swells.

My invention further consists in providing a metallic blank comprising two integral, concentric, and coaxial cylindrical members, connected at their lower or outer ends, the inner cylindrical member or sleeve being adapted to fit Within the lower terminal bore of the bobbin, and to act as an inner metallic so revolved, forming or spinning the outer metallic sleeve or cylinder snugly around the annular beads or swells thus surrounding each of said beads or swells of the bobbin with an outer metallic casing, and thus in terlocking the metallic terminal member with the bobbin so that it will beperm'anently secured tothe same. The outer metallic sleeve portion thus spun snugly onto the lower terminal of the bobbin, and shaped around and into interlocking engagement with the am1u lar beads on the lower end of the bobbin, produces integral, metal encased lower terminal grip rings on the bobbin, which will not only resist ordinarywear and tear, but which will be more resistant to crushing forces than the ordinary wooden bobbin ends with spring wire grip rings employed heretofore.

For the purpose of illustrating my invention, I have shown in the accompanying drawings forms thereof which are at present preferred by me, since they will give in practice satisfactory and reliable results, although it is to be understood that the various iiistrumentalities of which my invention consists can be variously arranged and organized and that my invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and described.

Referring to the drawings:

Figure 1 represents a perspective View of a metallic blank form of the combined inner metal shield and outer metal grip for the lower terminals of bobbins, embodying my invention, and shown in the original condition, before its application to the bobbin.

Figure 2 represents a perspective view of the lower terminal of a wooden bobbin, before the application thereto of the combined inner metal shield and outer metal grip, shown in Figure 1.

Figure 3 represents a longitudinal section taken through the axis of a bobbin, shown after the blank combined inner shield and outer metal grip, shown in Figure 1, has been applied thereto, and prior to the final shaping or spinning operation. I

Figure 4 represents a similar longitudinal section of the lower terminal portion of the bobbin, after the combined inner metal shield and outer metal grip has been shaped or spun snugly onto the terminal of the bobbin, into interlocking engagement with the series of annular beads or swells of said lower terminal of the bobbin.

Figure 5 represents a similar sectional view to that shown in Figure l, illustrating a modified embodiment of my invention.

Figure 6 represents a sectional View, similar to that shown in Figure 4, illustrating a further modified embodiment of my invention, in which metallic annular beads are employed instead of the wooden beads shown in Figures tand 5. V v V I Figure 7 represents a sectional view similar to that shown in Figure 6, illustrating a further modified embodiment of my invention.

Figure 8 represents a perspective view of the lower terminal portion oi a bobbin, having the combinedinner metal shield and outer grip applied thereto, embodying my inven 1011.

Referring to the drawings, in which like reference characters indicate like parts, 1 designatesthe wooden bobbin having a hollow or tubular body portion 2, and the enlarged lower terminal portion 3, having the axial bore 4, extending therethrough.

According to my invention, a plurality, usually three, spaced annular beads or swells 5, (Figures 2 and 3) are provided on the enlarged lower terminal portion 3 of the body of the bobbin. 7

The beads or swells 5 may loo-formed integrally with said lower terminal portion 3 during the turning of the wooden bobbin blank, and are preferably of a generally semicircular cross-section, and spaced from each other a suitable distance.

The combined inner metal shield and outer metal grip 6, as shown in perspective view in Figure 1 and in section in Figure 3, is first formed-in the shape of an integral double cylindrical blank by die pressing or other means, and includes an outer cylindrical shell 7, composed of the small diameter portion '8 at the closed terminal thereof, and the large diameter portion 9. The latter is of a diameter adapted to pass snugly over the periphery of the annular beads or swells 5 as shown in'Figure 3. The double cylindrical metal blank 6 also includes an inner cylindrical member 10, formed integrally with the outer cylindrical member 7 and connected with the latter, at the outer end thereof, by

an annular web 11-, as shown particularly in Figures 1 and 3. The inner cylindrical member 10 is of a diameter adapted to fit snugly within the terminal bore 4 of the bobbin.

The double cylindrical blank 6, shown particularly in Figures 1 and 3, may be formed of any suitable and substantially hard metal, of a suitable thickness, and preferably of a metal which may readily be shaped by spinning, rolling, or the like. The double cylindrical metal blank thus formed is forced over the lower enlarged terminal 3 of the bobbin 2, as shown particularly in Figure 3, with the iii) 5a.. and

inner cylindrical portion fitting snugly with in the inner bore 4: of the bobbin, and the larger diameter cylindrical portion 9 fitting over the beads or swells. The bobbin isthen placed in a suitable lathe, or the like, is re volved at a suitable speed, and while so revolved the enlarged diameter cylindrical portion 9 is shaped, that is, is spun into suitable annular ridges and furrows, as shown particularly in Figures a to 7 inclusive, until the same conforms to and snugly encases the annular beads or swells 5 on the lower terminal portion of the bobbin, as well as the terminal of the bobbin itself, thereby forming corresponding annular metallic beads, swells or grip rings 12 on the exterior of the terminal of the bobbin.

The integral annular metallic grip rings 1:2, thus formed, are more permanent, rigid and durable, than the individual spring wire grip rings employed heretofore, formed by the application of a series of hard wire split rings to the terminal of the bobbin, and the integral grip ring construction of my invention will resist not only wear, but will also resist any crushing force, much more readily than the grip ring employed heretofore. This added strength is due not only to the integral structure of the grip rings, but is also due to the fact that the outer grip rings are also supported and reinforced from within, by the inner metal shield.

If desired, the cylindrical shell 9 may be extended a suitable amount so as to project beyond the shoulder 13, and may then be turned or spun inwardly against said shoulder, thereby more firmly to secure the grip ring shell 7, as well as the inner sleeve 10, to the wooden bobbin. This modification is shown particularly in Figure 5.

In Figures 6 and 7 T have illustrated a further modification of my invention. Tnstead of providing wooden beads or swells 5, I provide corresponding annular grooves or recesses 14, in the enlarged terminal portion 3 of the wooden bobbin, and insert in each of said grooves a suitable split metallic ring 15, preferably of a hard spring wire sprung into said groove. 1 then superimpose the outer metallic blank 6 upon said metallic rings, beads or swells 15, thus formed and spin the outer cylindrical shell 9 onto said rings 15 snugly, thereby to encase the same in an integral metallic shell, which when finished, will have the same general contour as the inner rings, that is, will have a plurality of annular beads or grip rings. This construction, as shown in Figures 6 and 7 possesses the advantage of having a metallic core within each of the grip rings, thus further reinforcing the same against any crushing force. In Figure 7 moreover, I have illustrated a further modification in which the outer cylindrical shell member 9 is also spun around the shoulder 13, thereby further to secure the combined outer metallic grip to the bobbin.

It will thus be seen that by my novel construction in, and novel method of forming, outer grip rings upon the lower terminal of bobbins, I am enabled to produce bobbins for automatically reloading shuttles, which will be more durable than the bobbins employed heretofore and in which the grip rings are formed integrally with each other and also integrally with the inner metallic shield, within the terminal bore of the bobbin, whereby the terminal of the bobbin is also reinforced against wear as well as against any crushing force such as is exerted when the bobbin is inserted into or removed from the shuttle at the speed of reloading this type of shuttles. Moreover, by my novel method of spinning a blank metallic cylinder onto a preformed series of beads or swells either formed of wood or formed of metallic rings, the cost of the production of the novel combined inner metallic shield and outer metallic grip, is greatly reduced.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is 1. In a bobbin of the character stated, an elongated tubular body portion, having an enlarged lower terminal portion, a plurality of spaced individual annular metallic rings on said enlarged terminal portion, an integral inner metallic shield and outer metallic grip cylinder upon said terminal of the bobbin, said inner metallic shield extending into the bore thereof, and said outer portion surrounding said rings and encasing the same snugly, so as to form a plurality of outer, spaced annular, integral metal-encased beads.

2. The method of making bobbins of the character stated, which consists in forming a plurality of spaced annular grooves upon a terminal of the bobbin, inserting metallic rings in said grooves, superimposing an integral metallic cylinder upon said rings, revolving said bobbin at a suitable speed and spinning the metal of the outer cylindrical casing between the series of spaced annular rings so as to encase the same snugly and thus to form corresponding integral metal-encased beads.

CLARENCE E. CUNDEY. 

